使用自动布局水平对齐UIButtons（以编程方式）

Question

我正试图水平放置2个UIButtons但没有运气

1. 我正在以编程方式使用自动布局约束。

2. 我不想把它们放在一个容器中，并将中心对准那个容器。

   @Autowired
   @Qualifier("userAccountService")
   IService<UserAccount> service;
   
   @Override
   public IService<UserAccount> getService() {
       return service;
   }
   
   @RequestMapping(value="/login", method=RequestMethod.POST)
   public @ResponseBody UserAccount login( String username, String password ){
       UserAccount userAccount = ((UserAccountService)service).loadUserByUsername(username);
       return userAccount;
   }
   
   @Secured("ADMIN_ROLE")
   @RequestMapping(value="/test", method=RequestMethod.POST)
   public @ResponseBody String test(){
       return "test...";
   }
   
   @RequestMapping(value="/denied", method=RequestMethod.POST)
   public @ResponseBody String denied(){
       return "denied...";
   }
   

第二个按钮从第一个结尾处开始，但是在下一行，而不是相同的。

Answer 1

我已经尝试过你的代码，但它已经崩溃了，所以根据你的问题你只需要写下面的代码。

UILabel *lblText = [UILabel new];
[lblText setText:@"Some Title Text"];
[lblText setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.view addSubview:lblText];

UIButton *btnRed = [UIButton new];
[btnRed setBackgroundColor:[UIColor redColor]];
[btnRed setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.view addSubview:btnRed];

UIButton *btnGreen = [UIButton new];
[btnGreen setBackgroundColor:[UIColor greenColor]];
[btnGreen setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.view addSubview:btnGreen];

UIView *vwLine = [UIView new];
[vwLine setBackgroundColor:[UIColor blueColor]];
[vwLine setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.view addSubview:vwLine];


NSDictionary *dictViews = @{@"red":btnRed,@"green":btnGreen,
                            @"line":vwLine,@"lbl":lblText};

NSDictionary *dictMetrics = @{@"height":@(40),@"offset":@(-40)};
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-20-[red]-0-[green(==red)]-20-|" options:0 metrics:nil views:dictViews]];

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-20-[line]-20-|" options:0 metrics:nil views:dictViews]];

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-20-[lbl]-20-|" options:0 metrics:nil views:dictViews]];

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(height)-[lbl]-(height)-[red(height)]-(offset)-[green(==red)]-50-[line(2)]" options:0 metrics:dictMetrics views:dictViews]];

结果：

希望它能帮助您解决问题。如果有任何疑问，请告诉我。